4b^2-b-200=0

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Solution for 4b^2-b-200=0 equation:


Simplifying
4b2 + -1b + -200 = 0

Reorder the terms:
-200 + -1b + 4b2 = 0

Solving
-200 + -1b + 4b2 = 0

Solving for variable 'b'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-50 + -0.25b + b2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + -0.25b + 50 + b2 = 0 + 50

Reorder the terms:
-50 + 50 + -0.25b + b2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + -0.25b + b2 = 0 + 50
-0.25b + b2 = 0 + 50

Combine like terms: 0 + 50 = 50
-0.25b + b2 = 50

The b term is -0.25b.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25b + 0.015625 + b2 = 50 + 0.015625

Reorder the terms:
0.015625 + -0.25b + b2 = 50 + 0.015625

Combine like terms: 50 + 0.015625 = 50.015625
0.015625 + -0.25b + b2 = 50.015625

Factor a perfect square on the left side:
(b + -0.125)(b + -0.125) = 50.015625

Calculate the square root of the right side: 7.07217258

Break this problem into two subproblems by setting 
(b + -0.125) equal to 7.07217258 and -7.07217258.

Subproblem 1

b + -0.125 = 7.07217258 Simplifying b + -0.125 = 7.07217258 Reorder the terms: -0.125 + b = 7.07217258 Solving -0.125 + b = 7.07217258 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + b = 7.07217258 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + b = 7.07217258 + 0.125 b = 7.07217258 + 0.125 Combine like terms: 7.07217258 + 0.125 = 7.19717258 b = 7.19717258 Simplifying b = 7.19717258

Subproblem 2

b + -0.125 = -7.07217258 Simplifying b + -0.125 = -7.07217258 Reorder the terms: -0.125 + b = -7.07217258 Solving -0.125 + b = -7.07217258 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + b = -7.07217258 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + b = -7.07217258 + 0.125 b = -7.07217258 + 0.125 Combine like terms: -7.07217258 + 0.125 = -6.94717258 b = -6.94717258 Simplifying b = -6.94717258

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.19717258, -6.94717258}

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